Hi unhistory,
I'm not sure what you mean. Do you have a 3-D line (each point on the line represented by an x,y,z triplet) and you want to plot this using a 3-D plot so you can visualize it?
Or perhaps a table of data with x on the rows, y on the columns and the cell values representing z values?
Or are you just trying to add an additional axis to a 2-D plot?
Damon